跨膜转运 Passive transport(被动转运) Gases Hydrophobic Small polar Large polar Charged molecules molecules molecules molecules H+ ci- simple diffusion（单纯扩散) C07 Ca2+ facilitated diffusion（易化扩散) 02 Benzene Ethanol Glucose Amino acids Active transport（主动运输) primary active transport (原发性主动转运) second active transport 继发性主动转运 出胞与入胞 跨 膜 转 运 Passive transport（被动转运） simple diffusion（单纯扩散） facilitated diffusion（易化扩散） Active transport（主动运输） primary active transport （原发性主动转运） second active transport 继发性主动转运 出胞与入胞